A single-ended laser driver with shunt coplanar waveguide for reduced crosstalk

This paper describes a driver circuit for two-dimensional VCSEL arrays. The driver circuit uses a novel low-impedance shunt coplanar waveguide to minimize interchannel crosstalk. To demonstrate our approach, a 10 Gb/s GaAs HBT driver circuit has been designed and fabricated. Both measured and simulated results show a 20 dB crosstalk improvement compared to similar designs using conventional microstrip and coplanar waveguides. To the best of our knowledge, the crosstalk is the lowest reported for a two-dimensional VCSEL array driver in the open literature.